One week before the disaster of the entertainment district The sound pillar Uzui Tengen took Tanjiro,Inosuke and Zenitsu to a banquet.While the banquet, Zenitsu was a little distracted. But suddenly the intensity of the lights dropped at the same time that an instrument began to play. Zenitsu: Huh? What is happening? You could see that behind the paper curtain there was a girl playing an instrument called biwa which caused a lot of interest and curiosity on Zenitsu